<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Document</title> 
  <script src="vue.js"></script>
</head>
<body>
  <div id="app">
    <parent></parent>
  </div>

  <template id="child">
    <div>
      <button @click="click">Send</button>
      <input type="text" v-model="message">
    </div>
  </template>
  
  <script>
    Vue.component('parent', {
      template: '<div><child @childFn="transContent"></child>' +
                  '子组件传来的值 : {{message}}</div>',
      data () {
        return {
          message: ''
        }
      },
      methods: {
        transContent (payload) {
          this.message = payload
        }
      }
    })
    // child组件
    Vue.component('child', {
      template: '#child',
      data () {
        return {
          message: '子组件的消息'
        }
      },
      methods: {
        click () {
          this.$emit('childFn', this.message);
        }
      }
    })
    var vm = new Vue({ el: '#app' })
 </script>
</body>
</html>